For the first 6 months of 2015 we had 99.998 availability, with NO unplanned outages (knock on wood).
We have had 1,590 releases of our site this year thru August 3, with only 2 requiring us to take the site down (2 minutes once and 5 minutes once).
The two planned outages in the first half of 2015:
- 2 Minutes – March 6 – 2 Minute Database Maintenance
- 5 Minutes – March 26 – 5 Minute Database Upgrade for Financial System
Since these were both planned, we warned users beforehand and had only minor impact on users.
You can read more about our design for high availability here.